> the journal Wilderness & Environmental Medicine, concluding that instead, details “point compellingly to hand-to-mouth transmission.” Put more simply: The afflicted campers failed to properly wash their hands after using the bathroom.
There is absolutely no doubt about this.
That doesn't even make sense, if you think about it. The only way to be exposed to one of these diseases from your own feces would be if you already had the disease.
Washing your hands can help prevent infections from spreading to others, certainly, but your own gut microflora is extremely unlikely to pose a threat to you personall.